Tire mounting and demounting machine



'T,6I5,469 Jan. 25,1927. l MQKENZIE TIREMOUNTING AND DEMOUNTING MACHINE Filed Sept. 22, 1925 take ,5 H is the pneumatic tire in position and mounted in was its. J25, 1927.

f UNITED "STATES PATENT OFFICE.

' some n n-1mm; or dinner, mssacnusnr'rs. I

TIRE MOUNTING AND DEMOUN'ILDTG MACHINE.

Application ma September '22, 1925. Serial 130.373;

f My invention comprises a means for mounting and demounting tires on wheels for automobiles and is specially applicable to the heavier solid 'or'disc wheels such as are used on automobile trucks and buses.

Ordinarily the mounting and de'mounting of tires, especially the heavier sizes involves several hours of laborious, dirty work but by the use of .m' invention the heavy labor is practically e 'minated and the work on' Figure 2 is a vertical section through the centre line of Figure 1; Figure is a plan view of the cross. bar device carrying a pressure shoe-on each end; identical parts in each fi re are designated by the same letter.-

ferrin now to the-figures in detail, A is a rugge y built pedestal made of either wood or metal and having its base B extendedand specially'weighted; C is a rugged stud bolt set into the top of A and secured in an immovable conditio'n by-the lock nut 'D;'E is a"threaded pressure nut adapted to travl up or down on the stud bolt F is a stroii cross barmade of either wood or metal an havin a hole through its centre to clear the stud bolt C; G G are curved shoes bolted to F and having their hearing faces curved to suit the contour of the tire;

Qthe-solid-ilisc wheel K. ...It will a parent to any one familiar with the art om'an inspection of. .these figures 'ust how the device is used;-it will be observed that Figures 1 and 2 show a behicle'yheel placed in sucha position that if pressure will be forced I It will be noted that net a few turns of the brought to bearu 'onthe cross bar F by he application 0 a common w'r'ench to the ressure nut E,- the tire H ownward" ofi the wheel K.

wrench will serve to expount the tire.

understanding of my invention.

Onthe other hand if it is desired to mount a new tire on the wheel K all that is necessary is to unscrew the pressure nut E,"remove the cross bar F and reverse the position of the.

whee K on the pedestal A turning the conv vex side of the wheel upwards; now place the new tire loosel inits osition on the rim of the wheel I ;place t 1e cross bar F in position again with its pressure shoes G 'G bearing upon the new tire; put the res- -sure nut E in place and turn the latter own with a wrench until the new tire is forced into posltion on the rim; the lock ring may now be adjusted and'the ressure nut loos- H ened up. It will be rea 11y apparent that the construction and o ration of this .de-

vice is simplicity in itse f but one advantage that may not be so apparent is that the pedestal may be tipped over into a horizontal position by a slight pull'upon the stud C; in this horizontal position any heavy wheel may be easily threaded on the stud and'then the pedestalrestoredto the 11 right position, this process being facilitated y the ,weighting of the base B. Thus it will be seen that in using this machine it is. never necessary for an operator to lift the heavy wheels either on to or off the pedestal but simply to tilt the pe'de'stal'toa horizontal position for purposes of either loading or unloading wheels,

The drawings illustrate a simpleform of "making the device but I realize that various forms may beadopted and in fact I have at present in use various other forms one of which is an adjustable cross bar F having the shoes G G adjustable to. suitdifierent diameters of wheels and tires.

Having Awheel tire press conslstlng of a stand of suitable dimensions and material, weighted at the base but tiltable from a vertical to ahorizontal position by hand pressure; a. threaded bolt extending from said stand; a"pre'ssure nut adapted to'travel on said bolt and a means for transmitting the pressure fromsaid travelling pressure nut to a tire substantially as shown.

thus fully. described and illustra-ted the construction and operation of my "device what I claim and wish to protect'by Letters Patent is as follows wheel Join: MQKENZIIE. 

